1

Scalp is the part of the skin on the skull, deeply attached to the skull and has the hair shafts from it.Rest of the skin in the head like facial skin(beard) has only 2 layers -epidermis and dermis. Scalp has 5 different layers unlike facial skin/rest of skin all over body .Scalp-s-epidermis, c-conn.Tissue, a-aponeurosis, l-loose areolar conn. Tissue and p- pericranium attached to the skull bones.
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2

Allergic reaction:
The severity of allergies varies and can range from minor irritation to anaphylaxis (shock) — a potentially life-threatening emergency. If your symptoms after starting a new medication, call the doctor who prescribed it immediately. If you are developing a breathing problems call 911.
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4

Keratosis pilaris:
Your description sounds like a dermatologic condition known as keratosis pilaris. This condition produces rough and pimple-like bumps on the upper outer arms and back. Sometimes the inner thighs and face can also be affected.
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7

Rash:
Rashes are like baskins robbins, they come in 31 different flavors. You really need to see a doctor for a rash since the only way to get an effective evaluation and treatment is for a doctor to see the rash in-person.
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11

probably an allergy:
With this distribution and without symptoms of infection like fever, malaise or joint pains this probably represents an allergy. Diagnosis would depend on the appearance and distribution of the rash. See your dermatologist.
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12

Dermatitis:
You may have a form of dermatitis. Also if you have warmth this may be a sign of vasodilation from an allergy reaction or possibly be related to a skin infection. A picture would help to tell what is happening. Consider a healthtap consultation.
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13

Rash:
Rashes are difficult to diagnose without being seen. Is it flat, pebbly, blistery? How long present? How large an area involved? Any contact with poison ivy personally or a pet? Any exposure to ticks? Any exposure to measles/chickenpox/etc? See pcp for evaluation & treatment of rash.
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14

Many factors:
Try to see what has changed - anew shirt, clothing that touches the neck area, new detergents, not rinsing off the laundry detergent properly, etc. If persists then seek help of a physician who can help control symptoms while a work up is started.
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15

Check this out:
If this has not gone away I would suggest checking it out. It's hard to say what this may be without seeing it. Skin cancer is always a possibility. Also, a biopsy may be necessary.
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16

When you are ill:
It sure sounds like you are ill. You have a series of symptoms that do not fit one pattern. Based upon the variety of your symptoms i believe you need to be seen by your family physician soon.
However, if the neck stiffness worsens or if you have a fever you need to be seen urgently.
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17

Scabies/lice:
Have you sought treatment for both at a primary care doctor's office? Try treating scabies along with everyone who lives in your house. Change sheets, and wash along with clothes towels, etc Apply thin layer of cream to complete skin surface of the body from the neck down and leave on overnight. Rinse 8-12 hours later. May repeat in 2 weeks if necessary. 5% permethrin cream.
Vacuum couches, etc
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18

Probably unrelated:
You may possibly have contracted scabies from the contact but there are also other potential causes unrelated to the sexual contact. See a doctor if this has been presented for more than 3 days or been getting worse.
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19

Uncertain.:
This can't be diagnosed with the information that is available. A history, physical examination & other studies may be needed to determine cause/causes. Once accurately assessed a treatment plan can be developed.
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